Wrapping machine



I Sept. 24, 1935. 1 K. E. Y. LINDBERG 2,915,223

WRAPPING MACHINE Filed Dec. 22, 1933 3 Sheets-Sheet l IN V N TOR.

A TTORNEYS.

Sept. 24, 1935. K. E. Y. LINDBERG I 2,015,228

WRAPPING MACHINE Filed Dec. 22, 1933 Sheets-Sheet 2 IN l INTOR.

A TTORNEYS.

p 7 1935- K. E. Y. LINDBERG WRAPPING MACHINE Filed Dec. 22, 1953 3 Sheets-Sheet 3 yW /SS? BY w ATTORNEYS.

Patented Sept. 24, 1935 PATENT @FHQE 2,015,228 WRAPPING MAcniNE Knut E. Y. Lindberg,.Sundbybe1-g, Sweden, as-, signer to Erik Dahlherg, Stockholm, Sweden Application December 22, 1933, Serial No. 703,653 In Sweden December 23, 1932 7 Claims.

This invention refers itself to a machine for covering an article with a paper or a similar wrapper.

W The main object of this invention is to provide a machine by which the wrapping can be performed mechanically thus increasing the output.

Another object of the invention is to avoid manual operating of such articles which of various reasons may be prevented as far as possible 1b from avoidable touch with the operators hands as is the case especially with foods such as breads or the like.

' A further object of this invention is to simplify the handling of articles of standardized sizes when 15' being wrapped and thus to decrease the costs for such operations.

In the accompanying drawings an embodiment of this invention is illustrated in order to explain the principal parts of the machine, and how they will operate.

Figure l is a perspective view of the machine.

Figure 2 shows on an'enlarged scale a vertical section through the main portion of the operating parts looked from the fore end of the machine, and

Figure 3 shows in section the same parts as in Figure 2 but looked from the one side of the machine.

In the drawings, l designates four stanchions 3U- jointed by tie bars 2 and 3, and constituting a frame for the support of a stationary fore table '4 and a'stationary rear table 5 on the same level as table 4, and separated therefrom by a vertically movable table 6, the size of which accommodates the sizes of the articles which are to be covered by a wrapper. Thus, the width of table 6 in the length direction of the machine may be substantially equal to the width of the article to be treated thereon, and the length of said table 6 in the lateral direction of the machine may be somewhat less than the length of said article. In the initial position of the machine the movable table 6 is on a level with the fore and rear tables 4, 5.

The movable table 6 is connected to a head 1 from which a tubular sleeve 8 projects vertically downwards, said tubular sleeve 8 being carried in a guide 9 supported by a cross bar I ll secured between the lower longitudinaltie bars 3 of the frame. 7

A sleeve l l is movable telescopically within the sleeve 8, and at its lower end whichprojects downwards from the guide 9 it is connected to a suitable actuating means. This may for instance consist of a lever l2, movably connected to the rod I I by means of a bolt 13 and provided with a treadle is or the like at the front end of the machine.

The rod 5 i in its upper part is provided with a cavity i5, and the sleeve 8 is provided with two slots l5 diametrically opposite to each other and 5 extending from the upper end of the sleeve 8 substantially down to the lower end thereof. The slots 86 and the cavity !5 are in alignment. A catch ii is pivctally supported at an intermediate part within the cavity 115 and is actuated by a' leaf-spring iii secured in the lower part of the cavity to the rod H, which spring tends to turn the catch li clockwise (vide Fig.3), so that the upper end of said catch, which is provided with a hook is, projects from the cavity l5 and one of 15 the slots it to one side of the sleeve 8, while the lower end of the catch which is provided with a cam 29, projects from the cavity 55 and the opposite slot it to the other side of the sleeve 8.

A collar 2! is slidably mounted on the rod 8,

7 said collar being provided with a pair of lugs 22 projecting in opposite directions. In a like manner the head i is provided with a pair of lugs 23 at its lower end in which last mentioned lugs chain pulleys 24 or the like are rotatably supported. A rod 25 extending in the longitudinal direction of the movable table 6 transversely passes through the head Land is secured to the said head by means of a bolt 26. Each of the opposite ends of the rod 25 carries a sleeve 2i which sleeves are slidable on the rod 25 and prevented from turning round by for instance pins or keys fitting into longitudinal grooves in the rod 25. The sleeves 27 are provided with upwardly projecting lugs 28 supporting pivotal folding members 29, said sleeves 271' being slidable each between a stop flange as at the outer end of the rod 25 and a bracket 3! fast on the rod 25 and spaced apart from flange 3%). Each bracket 3i supports a toothed guide or rack 32, meshing with the ratchet 3d of the folding member 29 the ratchet being journalled between the lugs 26 on a pin 33 mounted in the lugs. Spiral springs 35 on the rod 25 between the brackets 25! and the ends of the respective sleeves 2?, which springs tend to force the sleeves 2i outwards into contact with the flanges 3B. In this position the folding members 2% are swung outwards such as shown in Figures 1 and 2 full lines. The sleeves 27 are provided with downwardly projecting lugs 36, which are connected with the lugs 22 of the collar 2i on the rod 8 by the means of suitable flexible members such as for instance link chains 31, which chains are carried over guide pulleys 24, as is evident from Figure 2. Thus, when the 001- lar 2| is moved downwards along the rod 8 the sleeves 21 on the rod 25 are forced inwards against the action of the springs 35, and the folding members 29 are swung upwardly above the ends of the movable table 6, due to the rotation of the gear wheels or pinion 34 cooperating with the racks 32, until the said folding members 29 have reached their positions shown by dotted lines in Figure 2.

Between the crossbar I9 and the collar 2| on the sleeve 8, there is a spiral spring 38 considerably more powerful than the springs35 fitted between the sleeves 2i and the brackets 3|, and serving normally to keep the movable table 6 in a raised position.

In the initial position, when the movable table 6 stands on a level with the stationary tables 4 and 5, and the folding members 29 are turned outwards as shown in Figures 1 and 2, full lines, the hook I9 of the catch I'I engages the upper edge of the collar 2| as is shown in Figure 3. Through this engagement, when the rod II is moved downwards by the action of the treadle I4, the collar 2| will be lowered along the sleeve 8, and the folding members 29 then start functioning as described. The cam shaped rear end 20 of the catch I. is adapted to coact with a bevelled surface 39 in the upper end of the guide '9. When the telescopical rod Ii moves downwards the wedgeshaped cam 23 of the catch I1 engages the bevelled surface 39, which results in the catch I? being turned in a counter clockwise direction as illustrated in Figure 3, whereby the hook I9 is retracted into the cavity I6 of rod II and releases the collar 2|, which latter thus returns to its initial position on sleeve 8 due to the action of the springs 35. On the rod I I continuing its downward movement the hook I9 gradually catches hold of the bottom of the slot I6, whereby the sleeve 8 and thus the movable table 6 also take part in the downward movement,

On the treadle I4 being released and the lever I 2 actuated upon by springs or the like returning to its initial position, the rod II ascends. In order that the catch I! then may return to its initial position with the hook I9 engaging the upper edge of the collar 2 I, there is a sloping surface 49 in the lower end of the collar 2|, as is evident from Figure 3, which sloping surface coacts with another sloping surface 49a on the hook I9, so that the catch I'I turns into the collar 2| and passes through it.

Two arms or brackets 4| project from the body of the guide 9 (Figure 3) towards the front end of the machine and movably support a substantially U-shaped lever 42. As is evident from Figure 3 the lower arm of the said lever lies in the track of a pin or the like projecting from the side of the telescopical rod II and consisting of for instance an extension of the bolt I3, said lower arm being actuated thereby when the rod II descends, the U-shaped lever 42 thus turning in a counter clockwise direction. A folding member 43 having a limited movement is attached to the upper arm of the lever 42 for instance by means of a bolt 44.

On a level with the movable table 6, when in its lowest position, there is a comparatively long table 45 extending backwards of the machine. At the front end of this low level table a roller 46 is yieldingly supported by arms 4'5 and kept a distance above table 45 by means of springs 48 which connect the arms 41 with some stationary part of the machine. Above the low level table 4 there are pivotably suspended a plurality of doors 49 or the like, the down edges of which are directed against the low level table 45 as shown in Figure l.

The operation of the machine is as follows:

Normally the movable table 6 is on a level with the stationary tables 4 and 5. A sheet of wrapping paper or similar covering material of suitable size is placed on the movable table 6, so that the edges of the wrapper everywhere project off the edges of the table 6 somewhat as much all around. The article to be wrapped, as for instance a loaf of bread of a generally elongated rectangular shape, is placed upon the said sheet of paper. The folding members 29 provided for the ends of the wrapping paper are held turned outwards as in Figures 1 and 2, full lines, by means of the springs 35, and the hook I9 of the catch engaging the upper edge of the collar 2| (Figure 3). The treadle I4 now being actuated, the telescopical sleeve II descends inside the rod 8, the collar 2| accompanying this movement, and the folding members, due to the transmission means 31 move inwards against the ends of the movable table 6 and also turned upwards and downwards above the ends of the article on the table, thereby folding the edges of the wrapper round the ends of said article (dotted lines in Figure 2). On the rod II continuing its downward movement the hook I9 releases the collar 2|, which latter returns to its initial position while swinging up the folding members 29, and hooks into the bottom of the slot I6, the movable table 6 thus being low- 'ered. When the table thus moves downwards,

the front and rear edges of the wrapper will be folded upwards, the facing edges of the stationary tables 4 and 5 serving as folding members. Immediately before the movable table 6 reaches its lowest position, the projecting end of the bolt I3 meets the lower arm of the U-shaped lever 42, with the result that the upper end of the lever 42 sup- 0 porting the folding member 43 is swung inwardly towards the article under treatment, and folds down the upright standing front edge of the wrapper over the article and further pushes said article backwards off the movable table 6 and upon the low level table 45. The article now is forced to pass below the yieldingly supported roller 46, which then folds down the upright standing rear edge of the wrapper over the preparatory down folded front edge thereof, and thus completes the 50 wrapping operation.

For wrapping up loaves and similar goods waterproof paper usually is used. The roller 46 then may be made possible to heat, for instance by means of electric heating coils inside the hollow roller. When the partially wrapped article passes under the hot roller the paraffin wax in the paper melts with the result that the ends of the wrapper, that are folded over each other, are stuck together.

When the article to be treated has been pushed off the movable table 5 and upon the low level table 45 by the U-shaped lever 42, the treadle I4 is released, and is pulled upwards by the action of the springs 35, so that the telescopical sleeve II returns to its initial position, and the rod 8 with table 6 is raised by the spiral spring 38 until the movable table 6 is on a level with the stationary tables 4 and 5. A new sheet of wrapper and a further article now can be placed on the movable table 6, the pedal I4 once again actuated, whereupon the last mentioned article becomes wrapped as above described and delivered on to the low level table 45 pushing the previously Wrapped article along.

, ,Whil the wrapped uparticles move along the low level table 45 the swivelling'doors 49 alongthe top surface of the articles, thus "preventing the edges of the wrapper stuck together by the roller 46 from becoming loose while the paraffining wax still is hot.

, Instead of using the swivelling doors 49 as shown, the same result, of course, may be attained by theguse of other suitable devices, such as for instance rollers carried on pivoting brackets or a plurality of vertically movable spring-actuated bars or simply a weighted cloth stretched at a short distance over the table 45 and trailing against the upper side of the wrapped up articles, the main thing being, that the said members are yielding so as not to deformthe articles under treatment.

The embodiment of the machine shown on the accompanyingdrawings is designed for wrapping 20 1 in this case they simply could be designed as loops.

" The shape and design of the'folding members entirely depend on the shape of the article to be wrapped and therefore will vary for each different case.

Instead of the treadle used in the wrapping machine as here described a suitable mechanically operated device, of course, may be used if desired.

As is evident other items of the machine may also be varied in different ways, without exceeding the bounds of this invention.

What I claim is 1. A wrapping machine comprising two stationary tables separated by a movable table for the article to be wrapped, a support secured to the table and projecting at its ends beyond the ends of the table, movable folding means mounted on the ends of the support at the ends of the table to fold the ends of a wrapper disposed on said movable table, means to move said folding members, means to lower the movable table, means to fold the one of the longitudinal edges of the wrapper on the movable table rearwards upon the article to be wrapped, and to remove said article when partially wrapped laterally off the movable table, a low level table in level with the lowest position of the movable table to receive the partially wrapped article when pushed off the movable table, a roller yieldingly supported at a distance above said low level table so as to permit the article under treatment to forcibly pass below said roller when pushed off the movable table, and a series of weighty members provided above the low level table behind said roller so as to act upon the wrapped article when pushed along said low level table.

2. A wrapping machine comprising two stationary tables separated by a movable table for the article to be wrapped, a support secured to the table and projecting at its ends beyond the ends of the table, movable folding means mounted on the ends of the support at the ends of the table to fold the ends of a wrapper disposed on said movable table, means actuated by the movement of the table and operative to move .said folding members, and means to lower the movable table, the last mentioned means combined with the means to move the folding members in such a way that when operating the machine the folding members will be moved in advance of the movable table, said lowering means comprising a vertical tubular .sleeve at its upper end rigidly attahed to the movable table and movably supported at its lower end, said tubular sleeve by meansof a catch connected to the means for operating of the machine.

3. A wrapping machine comprising two stationary tables separated by a movable table for the article to be wrapped, a support secured to the table and projecting at its ends beyond the ends of the table, movable folding means mounted on the ends of the support at the ends of the table to fold the ends of a wrapper disposed on said movable table, means to move said folding members, and means to lower the movable table, the last mentioned means combined with the means to move the folding members in such a way that when operating the machine the folding members will be moved in advance of the movable table, said lowering means comprising a vertical tubular sleeve at its upper end rigidly attached to the movable table and movably supported at its lower end, said tubular sleeve by means of a catch connected to the means for operating of the machine, and provided with a vertically slidable collar actuated upon by said catch and actuating said folding members by means of transmission means.

'said movable table, a tubular sleeve secured to said movable table at the upper end, andmovably supported at its lower end, a rod telescopically movable within said tubular sleeve, a cavity in the upper end of said telescopical rod enclosing a catch provided to cooperate with said 4 tubular sleeve, a pedal pivotally connected to the lower end of said telescopical rod, a collar vertically slidable on said tubular sleeve and operating said end folding members by transmission means, and a spring provided to normally cause said ratchet to connect said telescopical rod to said slidable collar.

5. A wrapping machine comprising two stationary tables separated by a movable table for the article to be wrapped, a support secured to the table and projecting at its ends beyond the ends of the table, movable folding means mounted on the ends of the support at the ends of the table to fold the ends of a wrapper disposed on said movable table, means to move said folding members, and means to lower the movable table, the last mentioned means combined with the means to move the folding members in such a way that when operating the machine the folding members will be moved in advance of the descent of movable table, said folding members pivoted each on a horizontal pivot and supported by sleeves slidable in a horizontal direction to and from the ends of said movable table. chains connecting said horizontally slidable sleeves to a vertically movable member, operable by means of a treadle, gear wheels on said horizontally slidable sleeves cooperating with horizontal guides so as to cause said folding members to turn about their pivots when slided horizontally by the movements of said vertically movable member.

6. A wrapping machine comprising two stationary tables separated by a movable table for the article to be wrapped, a support secured to the table and projecting at its ends beyond the ends of the table, movable folding means mounted on the ends of the support at the ends of the table to fold the ends of a wrapper disposed on said movable table, a tubular sleeve secured to said movable table at the upper end, and movably supported at its lower end, a rod telescopically movable within said tubular sleeve, a cavity in the upper end of said telescopical rod enclosing a catch provided to cooperate with said tubular sleeve, a pedal pivotally connected to the lower end of said telescopical rod, a collar vertically slidable on said tubular rod and operating said end folding members by transmission means, said catch at the one end provided with a hook which normally coacts with the upper edge of said vertically slidable collar so as to cause said sleeve to follow the down motion of said telescopical rod, said catch at its opposite end provided with a cam provided to cooperate with a stationary surface so as to release the hooked end of said catch from coaction with said vertically slidable collar, and a slot in the walls of said tubular sleeve, the bottom of which slot provided to' catch said hooked end of said catch when said telescopical rod has been lowered a certain distance so as to cause said tubular sleeve together with said movable table to follow the descending motion of said telescopical rod.

'7. A wrapping machine comprising two stationary tables separated by a movable table for the article to be wrapped, a support secured to the table and projecting at its ends beyond the ends of the table, movable folding means mounted on the ends of the support at the ends of the table to fold the ends of a wrapper disposed on said movable table, means to move said folding members, and means to lower the movable table, the last mentioned means combined with the means to move the folding members in such a way that when operating the machine the folding members will be moved in advance of the movable table, said lowering means comprising a vertical tubular sleeve at its upper end rigidly attached to the movable table and movably supported at its lower end, said tubular sleeve by means of a catch connected to the means for operating of the machine, a spring acting upon said vertically movable tubular sleeve so as to push said sleeve upwards when released from the downwards pulling force from the operating means.

KNUT E. Y. LINDBERG. 

